Careful application of pyrimethanil in time for phytotoxicity control

Pyrimethanil is effective against gray mold, but it's essential to know which crops are particularly sensitive to it. For example, legumes and eggplants can be more vulnerable to damage if the dosage isn't carefully managed. That’s why it’s crucial to follow recommended application rates and avoid overuse.

As an anilinopyrimidine fungicide, pyrimethanil has a unique mode of action. It targets gray mold pathogens effectively and is highly systemic, meaning it can move through the plant quickly and reach areas that are hard to access, like flowers and young fruits. Its performance remains stable even in cooler temperatures, making it a reliable choice in various weather conditions.

However, improper use can lead to phytotoxic symptoms. On eggplants, for instance, you may notice dark brown spots on the leaves, which can appear irregular in shape or cause yellowing and leaf drop. Some farmers mistakenly associate these symptoms with a "spotted deciduous disease" and may apply additional pesticides, worsening the issue. Therefore, it's vital to distinguish between true disease spots and phytotoxic effects caused by pyrimethanil.

Legumes, on the other hand, may show yellow or white discoloration on their leaves when exposed to high concentrations of pyrimethanil. In severe cases, the leaves can dry up and fall off, and even flowers may drop prematurely. While this doesn’t mean pyrimethanil should never be used, it’s best to avoid it on sensitive crops or apply it at very low concentrations.

The Chinese pesticide network recommends specific safe dilution rates for beans and eggplants. For example, when using 20% pyrimethanil powder, the maximum safe concentration during the growing season should not exceed 600 times. This means mixing 100 grams of the powder with at least 120 liters of water. Additionally, always ensure good ventilation when applying the product to reduce the risk of adverse effects.

In summary, pyrimethanil is a powerful tool for controlling gray mold, but it must be handled with care. By understanding its effects on different crops and following proper application guidelines, you can maximize its benefits while minimizing the risk of damage. Always read labels carefully and consider consulting local agricultural experts for tailored advice.